SqlCommand cmd=new SqlCommand("Select * from table1;select * from table2",this.sqlConnection1);
SqlDataAdapter dap=new System.Data.SqlClient.SqlDataAdapter(cmd);
DataSet ds=new DataSet();
dap.Fill(ds);
dataGrid1.DataSource=ds;
the forward code is running correctly. DataSet object can return
a set of table object. by default ,the TableName in the Tables
collection of dataset, is increased base on 0.(table,table1,table2..eg)